Re: [PATCH v3] fstests: test premature ENOSPC in zoned garbage collection

On Wed, Apr 15, 2026 at 07:53:52AM +0200, Johannes Thumshirn wrote:
> On 4/15/26 7:22 AM, Christoph Hellwig wrote:
>> On Tue, Apr 14, 2026 at 04:33:41PM +0200, Johannes Thumshirn wrote:
>>> This test stresses garbage collection in zoned file systems by
>>> constantly overwriting the same file. It is inspired by a reproducer for
>>> a btrfs bugifx.
>> s/bugifx/bugfix/
> Fixed
>> I tried this on XFS, and it doesn't work as XFS uses SCRATCH_RTDEV for
>> zoned data.  Manually hacking in SCRATCH_RTDEV makes it work, but that
>> will break btrfs.  Maybe you can add a little:
>>
>> if [ -b "$SCRATCH_RTDEV" ];
>> 	zoned_dev=$SCRATCH_RTDEV
>> else
>> 	zoned_dev=$SCRATCH_DEV
>> endif
>>
>> end then use $zoned_dev to make it portable?
> Sure, can I still use _scratch_mkfs_sized for XFS?

Yes. It sizes both the main and RT device.